It's not that websites shouldn't have ads, it's just that the vast majority of websites in China have gone too far, with some having as much as 30% of the screen taken up by ads, whereas foreign websites keep them to 5% to 10%, so you're left with the impression that you're getting a great deal of refreshment.
Or as the saying goes, people are doing God is watching, China's network market is relatively closed, if and foreign network capital competition, soon to be the original form.
Baidu and Google is a good example, leaving aside the political position and national information security, Google's consumer experience than Baidu do not know which side to go. If Google hadn't launched the Chinese market, the world would not be this "bear-like".